The Common Principal Component Analyses of Multi-RCMs

Based on a 10-year simulation of six Regional Climate Models(RCMs) in phase II of the Regional Climate Model Inter-Comparison Project(RMIP) for Asia,the multivariate statistical method of common principal components(CPCs) is used to analyze and compare the spatiotemporal characteristics of temperature and precipitation simulated by multi-RCMs over China,including the mean climate states and their seasonal transition,the spatial distribution of interannual variability,and the interannual variation.CPC is an effective statistical tool for analyzing the results of different models.Compared with traditional statistical methods,CPC analyses provide a more complete statistical picture for observation and simulation results.The results of CPC analyses show that the climatological means and the characteristics of seasonal transition over China can be accurately simulated by RCMs.However,large biases exist in the interannual variation in certain years or for individual models.

贮藏温度对火棘鲜果采后生理及功效活性成分的影响

以重庆彭水野生火棘鲜果为试材,研究贮藏温度对火棘功效活性成分原花青素、黄酮、总酚和VC含量的影响,分析相关抗性酶超氧化物歧化酶(superoxide dismutase,SOD)、苯丙氨酸解氨酶(shenylalanine ammonia lyase,PAL)活性和次生代谢产物丙二醛(malondialdehyde,MDA)含量及腐损率变化趋势。结果表明:-5、-3、-1、1、3、5℃贮藏60 d原花青素保持率分别是初始含量的72.97%、65.43%、48.12%、29.76%、21.33%和19.22%;黄酮保持率分别为77.25%、76.27%、72.01%、60.39%、56.96%和35.19%;总酚保持率分别为83.66%、82.61%、62.80%、55.69%、48.51%和43.11%;VC保持率分别为87.17%、86.43%、75.46%、54.83%、36.06%和24.35%;SOD活性保持率分别为81.56%、79.78%、66.32%、27.86%、15.83%和11.25%;PAL活性保持率分别为57.43%、50.05%、42.00%、19.69%、15.62%和14.12%;MDA累积程度与初始含量相比,分别为2.19、2.59、4.51、6.52、7.52倍和8.54倍;腐损率与5℃贮藏60 d相比,分别低88.10%、87.94%、81.09%、54.25%和12.53%。-5、-3℃贮藏与5、3、1、-1℃贮藏相比均可有效保持原有功效成分、降低腐损率、减少MDA累积程度、保持较高SOD和PAL活性,但-5℃和-3℃贮藏差异不显著,-3℃可作为优选贮藏温度。

资源植物杜香的开发利用综述

杜香 (LedumplastureL .)是我国东北地区的资源植物 ,尤其是在大兴安岭地区蓄积量颇为丰富 ,多年来已引起了广大研究者的注意。但由于其产品质量存在问题 ,因而至今未能充分开发利用。笔者综述了杜香资源的开发利用现状 ,总结了杜香精油的提取、成分分析等情况 ,研究了其药用价值与芳香油价值。根据目前的研究利用状况 ,从资源生态化的角度出发 ,提出了合理。

生物破乳剂产生菌的筛选及破乳效能研究

建立一套高效的生物破乳剂产生菌筛选方法是解决破乳剂产生菌筛选困难的主要途径,利用这种方法从大庆油田采油废水中分离、筛选得到1株对水包油型(O/W)和油包水型(W/O)两种乳状液均具有破乳效能的高效生物破乳剂产生菌,该菌对这两种乳状液在20 h的破乳率均可达90%以上。生理生化鉴定及基于16S rDNA基因序列的系统发育分析表明,该菌属于芽孢杆菌属(Bacillus),菌株编号LH1。实验发现,LH1菌的有效破乳成分为胞外代谢物质,低温、高温及超声破碎处理均对其破乳活性无明显影响,说明破乳菌LH1具有良好的应用价值。

莺歌海盆地OBC多分量地震虚反射和鸣震压制及其效果分析

利用中国海洋石油总公司在莺歌海盆地采集的海底电缆(OBC)多分量地震数据,分析了虚反射及鸣震产生的物理过程和压制方法的原理,分别利用平均能量法及自相关求取海底反射系数的方法求取合适的叠加系数,将OBC资料中的压力分量和垂直位移分量进行叠加以消除虚反射和鸣震,取得了较好的压制效果,为该地区后续的高精度偏移成像和解释工作奠定了基础。

不同视觉区域OUP效应的眼动研究

采用眼动实验法,通过两个实验考察了不同视觉区域的OUP效应。结果显示:(1)当刺激材料分别平行呈现于左侧视觉区域和右侧视觉区域时,在右侧视觉区域产生了OUP效应,而在左侧视觉区域没有OUP效应,我们假设是由于左侧视觉区域首字母距离中央凹的不利位置影响了OUP效应的产生。(2)当垂直方向呈现刺激时,在两侧视觉区域均产生了明显的OUP效应,表明首字母距离中央凹处于有利位置时不会影响OUP效应的产生。实验结果支持了大脑左半球和右半球在词汇识别时的策略为系列加工,对左半球平行加工右半球系列加工的结论提出了质疑。

Spatial and Temporal Differences of Urban Land Comprehensive Carrying Capacity in Guangxi

The comprehensive carrying capacity of urban land can reflect the re- source level, economic scale, social development and environmental pressure of ur- ban land carrying. The assessment indicator system of urban land comprehensive carrying capacity was constructed from the 4 aspects of resource, economy, society, environment, and principal component analysis and cluster analysis were used to evaluate the urban land comprehensive carrying capacity of Guangxi and the 14 cities in 2005-2014, and analyzed its spatial and temporal characteristics as well as the driving forces, with the aim to provide references for improving the urban land comprehensive carrying capacity. The results showed that, the overall urban land comprehensive carrying capacity in Guangxi increased in 2005-2014, and there were significant differences in the land comprehensive carrying capacities among the cities in Guangxi in 2005-2014, in which Liuzhou, Guilin, Nanning belonged to the regions with the highest carrying capacity, while Beihai, Yulin, Wutong belonged to the regions with high carrying capacity, and the carrying capacities of the other cities changed with the changes of time. The economic development degree was an important factor influencing urban land comprehensive carrying capacity, but could not directly represent the urban land comprehensive carrying capacity level.

我国农村金融发展与农村经济增长——基于科技投入的门槛效应分析

金融发展与经济持续增长两者之间的关系长期以来一直是金融发展理论界探讨的核心内容。该文用1998—2018年中国30个省(市、自治区)(西藏除外)统计数据,采用面板回归门槛模型实证分析不同农业科技投入水平下农村金融发展水平对农村经济增长的影响,并得出农村金融发展存在显著的双重农业科技门槛效应的结论。当农业科技投入处于较低的水平时,农村金融发展对农村经济增长具有显著的负效应影响,随着农业科技投入的提高,农村金融发展对农村经济增长的负向影响逐渐变小,并最终转变为正向影响。因此,要把握农村金融发展对农村经济持续增长的主导作用,既需要农村金融自身发展革新,还必须加大农业科技投入。

50批不同来源白术药材及饮片中白术内酯Ⅰ和白术内酯Ⅲ含量的HPLC法测定

目的:采用HPLC法测定不同来源白术药材及饮片中白术内酯Ⅰ和白术内酯Ⅲ的含量。方法:采用Tigerkin C18(5μm,4.6 mm×250 mm)色谱柱,流动相为甲醇-水(67∶33);流速为0.8 mL.min-1;检测波长为220 nm;柱温30℃。结果:10批市售白术药材和40批市售白术片及麸炒白术片中白术内酯Ⅰ和白术内酯Ⅲ含量差别均较大。结论:不同来源市售白术药材及其饮片质量差别较大。